Information Technology Reference
In-Depth Information
Describe the basic operations of a dynamic routing protocol.
The router sends and receives routing messages on its interfaces.
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The router shares routing messages and routing information with other routers that are using
the same routing protocol.
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Routers exchange routing information to learn about remote networks.
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When a router detects a topology change, the routing protocol can advertise this change to
other routers.
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Dynamic Versus Static Routing Exercise
Dynamic routing certainly has several advantages over static routing. However, static routing is still used
in networks today. In fact, networks typically use a combination of both static and dynamic routing.
Consider each of the features in Table 3-1, and briefly list the advantages and disadvantage of dynamic
routing and static routing.
Table 3-1
Dynamic Versus Static Routing
Feature
Dynamic Routing
Static Routing
Configuration complexity
Generally independent of the
Increases with network size
network size
Requires administrator knowledge
Advanced knowledge required
No extra knowledge required
Topology changes
Automatically adapts to
Administrator intervention
topology changes
required
Scaling
Suitable for simple and
Suitable for simple
complex topologies
topologies
Security
Less secure
More secure
Resource usage
Uses CPU, memory,
No extra resources needed
link bandwidth
Predictability
Route depends on the
Route to destination is
current topology
always the same
Classifying Dynamic Routing Protocols
The following sections give an overview of the most common IP routing protocols. Most of these
routing protocols will be examined in detail later in this course. For now, work through these exercises
to reinforce your knowledge of dynamic routing protocol classifications.
